Improvement in joints for metal pipes



aient (affilier.

Letters Patent No. 98,960, dated Jennery 18, 1870.

IMPROVEMENT IN JOINTS FOR METAL PIPES.

The Schedule referred to in these Letters Patent and. making part of the same.

To all whom it may concern:

Be it known that I, W. H. HARRISON, of Philadelphia, Pennsylvania, have invented an' Improved Joint for Wrought-Iron Pipes; and I do hereby declare the following to Abe a full, clear, and exact description of the same. l

My invention consists in closing or connecting together wrought-irou`pipes, by forming on the end of each pipe a flange, andconning this flange between an internal ring, or its equivalent, and an externalor thin pipes of other metal;

Figures 4 and 5 represent my invention as applied to the connecting together of' pipes at right angles to each other;

Figures G and 7 represent two pipes united (in line with each other) in accordance with my invention; and

Figures S and 9, modifications of' my invention.

Before describing my invention7 I may state that more or less difficulty has been experienced in closing or uniting together l. p-welded tubes and other wroughtiron pipes by inexpensive appliances, the thinness and character of the metal militating against the employment of ordinary fastenings.

The object of` my invention is to overcome this difficulty-au end accomplished in the manner I will now proceed to describe.

Figs. 1, 2, and 3, illustrate one of the simplest modes of applying my invention, namely, to the closing o f pipes.

A is a lapewelded tube or other pipe, of wroughtl iron or other metal, the end of which is so bent as to form the internal bevelled flange a, which is adapted to the inclined or bevelled edge of' a cast-iron ring, B, the latter being fitted snugly to the inside ofthe pipe.

D is a cast-iron cover, having a recess, b, with a bevelled edge, e, adapted -to the `exteriorof' the b evelled flange a. e i

E E are two bolts, each having a hooked head, for catching into a recess, f, in the ring B, these bolts passing through holes in the cover I), on the outside of which they are furnishedlwith suitable nuts, h h.'v

When the' several parts are fitted together, as shown in fig. 1, and the nuts are tightened, the pipe is effectual] y closed, for it should be understood that the bevelled edge ofthe ring B, and the bevelled edge of' the recess in the cover, are made perfectly true, the flange also being made true, so that little or no packing is necessary, the combined action of the ring and cover on the flange being such, that when the bolt is tightened, the flange is compressed with such force as to insure a tight joint, the pressure being exerted on the flange through a wedge-like action.

The inclined flange has the further advantage of great strength, compared with a straight flange, in the forming of which the met-al is necessarily subjected to a much greater strain than in making the inclined flange.

As a mea-ns'of' resisting internal pressure, the inclined flange is much superior to the straight flange, for the abrupt'corner of the latter, weakened, perhaps, in bending the metal, would be exposed to rupture,

whereas the inclined flange, confined, as it is,.hetween i the cover and the ring, presents no such weak point.

The same remarks will apply to the flange shown in the modification, fig. 8,.where the flange, instead of being inclined abruptly, is made rounding, so as to form a ball-joint. The remarks will also apply to the modification, fig. 9, in which the joint is made partly rounding, and partly horizontal, the horizontal portion only being compressed.

While a flangebent abruptly at right angles may, in some cases, be used, flanges of any of the above forms are to be preferred, for the reasons given.

Figs. 4 and 5 represent the application of my in- Vvention to the joiningA together of two pipes at right angles to each other. In this case I lusea cast-iron elbow, G, having two openings, z' and t', the edge of the opening fi being arranged to receive the bevellcd or rounded flange of the pipe A, and the edge of' the opening t" for receiving the flange of' the pipe A.

. Each pipe has an internal cast-iron ring, B, similar to that described above,the ring of the pipe A being recessed, for receiving part of' the T-head of' the bolt H, which passesthrough the elbow G, and is furnished outside. the same with a suitable nut. The `ring B of the pipe A, however, is secured by two bolts E E, similar to'those described in reference to figs. 1, 2, and-3. By, this arrangement, the bolts for securing one pipe to the elbow cannot interfere `with the boltvfor securing the other pipe to the same elbow. l

In figs. 6 and 7, my invent-ion is illustrated as appliedto the uniting of two pipes in line with each other, A and A being the two pipes, the flanges on the ends of' which are external, and a single internal ring, B, is common to both pipes, for one edge of this ring is adapted to the flange of one pipe, and the other edge of thering is, in likeinanuer, adapted to the flange of the other pipe.

An external castfiron ring, I, is fitted to the pipe A, and a similar ring, I', to the pipe A', each ring being arranged to suit the ange of ,the pipe which itl surrounds.

The two rings are connected together by bolts E E, in a manner which will be understood without further explanation.

Other modifications of my invention will readily suggest themselves to those familiar with work of this class.

It will be seen that my invention, whether it be applied to the closing of wrought-iron pipes, or to thc `connecting of such pipes together, has one main characteristic, namely, the confinement of a flange formed ou the pipe between a ring inside the pipe, and a cover, elbow, or ring outside the same.

witnesses.

W. H. HARRISON. W'itnesses:

E. H. BAILEY, HARRY SMITH. 

